sci-physics/bullet: improve USE=test by masking it

It is broken such that src_compile itself fails when enabled, due to
cmake's charming habit of treating "FooLib" as a dependency, to mean
either "the library target aliased as FooLib", or "assume at compile
time that -lFooLib works". In this case the latter is triggered due to
conditionally disabled subdirs the tests depend on.

Yay stringly-typed DSLs. :/

We can go one step further and add a vital REQUIRED_USE. It is neecssary
but insufficient; "BussIK does not work out of the box" was always
wrong, it is rather built by what `-DBUILD_BULLET2_DEMOS=OFF` in the
ebuild is disabling. However, the demos themselves don't seem to
compile, so, ¯\_(ツ)_/¯.

Bug: https://bugs.gentoo.org/968510
Signed-off-by: Eli Schwartz <eschwartz@gentoo.org>

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